AMD: Zen 2 (Ryzen/Threadripper 3000?, Epyc 8000?) Speculation, Rumours and Discussion

Discussion in 'PC Industry' started by ToTTenTranz, Oct 8, 2018.

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  1. Rootax

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    What about a 14nm Cell :eek:
     
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  2. jlippo

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    Why use Cell when they have vector units from Emotion Engine? ;)
     
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  3. 3dilettante

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    There's some inconsistency from various sources about the exact die area of Zeppelin, from 192-213 mm2. AMD's EPYC marketing seems to go with the higher figure.
    CCX area is 44mm2, so removing the two CCXs from a Zen die leaves between 104-125mm2 of uncore. The 14nm IO die would have to have all of the functionality of the prior product, with whatever area PCIe 4.0 and additional features might add. The IO die doesn't need to have the same kind IFOP connectivity as a chip that might go into a 4-chip MCM, but at the same time its likely the links to each chiplet have double or more the bandwidth and may remove some of the limited area savings from that.
    Perhaps there's some mechanism for reducing latency for shared lines being used for synchronization, although some ideas indicated in patents would have a limited set of buffers at or near the memory controllers for that.


    That brings AMD's high-end cores into the same place as Jaguar and Intel's L1I. That would be the first time in a long time that the mainline cores would not have an L1 with a capacity too large for its associativity to prevent a possible aliasing problem where the same physical address can be cached in more than one place in the L1 due to different virtual translations. The cache would need to monitor and invalidate synonyms on the fly to prevent problems. Increasing associativity and/or reducing capacity to bring the relationship in line would be the most direct ways of handling it.
    From googling, I think the K5 was the last main core from AMD with that distinction.
    AMD submitted Linux changes for Bulldozer to help minimize the performance cost of such invalidations in the L1I, although at the cost of not allowing memory allocations with differing values in the affected addresses bits. I don't know what came of that, though I think there were objections from the maintainers of Linux due to this eating away at the entropy for ASLR.
     
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  4. hoom

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    #204 hoom, May 28, 2019
    Last edited: May 28, 2019
  5. fellix

    fellix Hey, You!
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  6. Alexko

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    Never mind that, if the main memory latency improvement is real, it's huge. This would probably change the gaming competitive landscape entirely.
     
  7. ToTTenTranz

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    It is? It seems in line with the whopping 4000MT/s speed of the RAM they put in it.
    What am I missing?
     
  8. Alexko

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    The current generation Ryzen CPUs have a memory latency closer to 80ns: https://www.hardware.fr/articles/974-4/gain-latence-lie.html

    Granted, that's with slower memory, but still!


    Edit: OK, more like 65ns with DDR4-3400:
    https://techreport.com/review/33531/amd-ryzen-7-2700x-and-ryzen-5-2600x-cpus-reviewed/4

    But this would still put AMD roughly on par with Intel, which would be a huge improvement.
     
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  9. 3dilettante

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    The bandwidth figures for the L2 and L3 don't look right, or at least don't look very good to AIDA64 results I've seen for a 12-core Threadripper. The L2 at least should be too tightly integrated with the core to be affected by any changes introduced by the chiplet strategy.
     
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  10. tunafish

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    This is a fake. Source: Stilt pointed out at iotech forums (Finnish) that this specific version of AIDA64 cannot output that specific "CPU Stepping" string. This was made in photoshop.

    Also, the cache latencies/bandwidths are more in line with Intel CPUs than Zen ones.
     
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  11. Alexko

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    Well then, there goes my hope for Zen2 as a gaming beast.
     
  12. xEx

    xEx
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    Seems like I'm going to get the 3600 or 3600x depends on how much difference there is with OC on them. Also this seems to show Adored's table was just made up.
     
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  13. Cyan

    Cyan orange
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    it's not easy to choose a Ryzen CPU nowadays, basically any model is soooo good. Also, my MSi B350M Gaming motherboard is compatible with the 3rd generation of Ryzen processors, so whenever I jump in, I am still not sure about what Ryzen CPU to choose. In that sense I think Intel is lagging behind nowadays, although I still prefer Intel processors when it comes to laptops.

    In a desktop computer though, there's nothing like Ryzen, imho
     
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  14. Malo

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    I'd recommend an X version and leave it to boost itself rather than manually overclocking to force all-core Mhz. As long as you have a good cooler, decent motherboard and some optimized power delivery, it will boost high when needed and manual OC won't really net you much higher, if anything.

    Of course that's coming from a zen+, we don't know the characteristics of Zen2 yet, especially given the chipset and i/o design.
     
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  15. xEx

    xEx
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    Yeah all Ryzen CPUs are good value but I think my sweetspot monetary is in the 200~ range. I got a Strixx B350 and 3k Mhz memory so will be plug and play.

    About the OC I heard from Actually Hardcore Overclocking that there will be a third clock region I assume its the memory controller/OI chip and will be OCble. We will see on 7/7.
     
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  16. itsmydamnation

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  17. xEx

    xEx
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    Well the translation is...difficult but lets hope its true.
     
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  18. Silent_Buddha

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  19. itsmydamnation

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    i dont actually care about 5ghz in all honesty,

    if i can get 6 to 8 core 4.6-4.7 all core O.C on a higher end B450/ value for money X470 with mid 3k mem clock and the hinted at ability ( by buildzoid) to control HT/IF clock then i'll be happy as larry will be happy as a pig in mud (i'll probably buy 3 :) ) .
     
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  20. hoom

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    Is he saying there will be a 5Ghz all core Black Edition?
     
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